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package org.ewhoxford.swt.bloodpressure.db;

import java.io.File;
import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;

import org.hsqldb.cmdline.SqlFile;
import org.hsqldb.cmdline.SqlToolError;
import org.hsqldb.lib.RCData;

/**
 * Sample class which executes SQL files, by embedding SqlFile.
 * <P/>
 * Suitable for using as a template.
 * <P/>
 * This class also serves as an example of using RCData to allow your
 * application users to store JDBC access information in a convenient text file.
 * 
 * @see #main(String[])
 * @see SqlFile
 * @see RCData
 * @author Blaine Simpson (blaine dot simpson at admc dot com)
 */
public class SqlFileEmbedder {
	private Connection conn;

	/**
	 * For applications that use a persistent JDBC connection, this class can be
	 * used to encapsulate that connection. (Just strip out the SqlFile stuff if
	 * you don't need that).
	 * 
	 * @return The encapsulated JDBC Connection.
	 */
	public Connection getConn() {
		return conn;
	}

	/**
	 * Run
	 * 
	 * <PRE>
	 *     java SqlFileEmbedder
	 * </PRE>
	 * 
	 * to see Syntax message.
	 */
	public static void main(String[] sa) throws Exception {
		if (sa.length < 3) {
			System.err.println("SYNTAX:  " + SqlFileEmbedder.class.getName()
					+ " path/ro/file.rc URLID file1.sql...");
			System.exit(2);
		}
		SqlFileEmbedder embedder = new SqlFileEmbedder(new File(sa[0]), sa[1]);
		String[] files = new String[sa.length - 2];
		for (int i = 0; i < sa.length - 2; i++) {
			files[i] = sa[i + 2];
		}
		try {
			embedder.executeFiles(files);
		} finally {
			try {
				embedder.getConn().close();
			} catch (SQLException se) {
				// Purposefully ignoring.
				// We have done what we want and are now going to exit, so
				// who cares.
			}
		}
	}

	/**
	 * Instantiates SqlFileEmbedder object and connects to specified database.
	 * <P/>
	 * N.b., you do not need to use RCData to use SqlFile. All SqlFile needs is
	 * a live Connection. I'm using RCData because it is a convenient way for a
	 * non-contained app (i.e. one that doesn't run in a 3rd party container) to
	 * get a Connection.
	 */
	public SqlFileEmbedder(File rcFile, String urlid) throws Exception {
		conn = (new RCData(rcFile, urlid)).getConnection();
		conn.setAutoCommit(false);
	}

	/**
	 * Your own classes can use this method to execute SQL files.
	 * <P/>
	 * See source code for the main(String[]) method for an example of calling
	 * this method.
	 * 
	 * @see #main(String[])
	 */
	public void executeFiles(String[] fileStrings) throws IOException,
			SqlToolError, SQLException {
		Map<String, String> sqlVarMap = new HashMap<String, String>();
		sqlVarMap.put("invoker", getClass().getName());
		// This variable is pretty useless, but this should show you how to
		// set variables which you can access inside of scripts like *{this}.

		File file;
		SqlFile sqlFile;
		for (String fileString : fileStrings) {
			file = new File(fileString);
			if (!file.isFile())
				throw new IOException("SQL file not present: "
						+ file.getAbsolutePath());
			sqlFile = new SqlFile(file);
			sqlFile.setConnection(conn);
			sqlFile.addUserVars(sqlVarMap);
			sqlFile.execute();

			// The only reason for the following two statements is so that
			// changes made by one .sql file will effect the future SQL files.
			// Has no effect if you only execute one SQL file.
			conn = sqlFile.getConnection();
			sqlVarMap = sqlFile.getUserVars();
		}
	}
}
